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High toughness yttrium oxide stabilized tetragonal zirconia material unaffected by sintering and preparation method thereof

A technology of tetragonal zirconia and yttrium oxide, applied in zirconia and other directions, can solve the problems of narrow sintering process parameter range, reduced fracture toughness of 3Y-TZP material, reduced metal ion distribution uniformity, etc., and achieves simple sintering process and sintering temperature. wide range of effects

Active Publication Date: 2019-08-09
SOUTHWEAT UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the zirconium salt is prone to hydrolysis and reduces the uniformity of metal ion distribution in the solution, the 3Y-TZP powder prepared by the above method contains a small amount of monoclinic phase.
The appearance of monoclinic phase in the starting powder will not only reduce the fracture toughness of 3Y-TZP materials, but also increase the risk of cracking of 3Y-TZP ceramics during sintering, making the range of sintering process parameters very narrow

Method used

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  • High toughness yttrium oxide stabilized tetragonal zirconia material unaffected by sintering and preparation method thereof
  • High toughness yttrium oxide stabilized tetragonal zirconia material unaffected by sintering and preparation method thereof
  • High toughness yttrium oxide stabilized tetragonal zirconia material unaffected by sintering and preparation method thereof

Examples

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Embodiment 1

[0042] With a purity of 99.99% Zr(NO 3 ) 4 ·3H 2 O and Y (NO 3 ) 3 ·6H 2 O is the raw material, in molar ratio Zr(NO 3 ) 4 ·3H 2 O:Y(NO 3 ) 3 ·6H 2 O=0.94:0.06 ingredients, use deionized water as solvent, prepare an aqueous solution with a total concentration of metal ions of 0.2mol / L, stir magnetically for 1-3h until it is clear and transparent, then add additives such as citric acid hexahydrate and molecular weight of 20000 Polyethylene glycol, wherein the amount of citric acid added 160g / L, polyethylene glycol 20g / L, and then magnetically stirred until clear and transparent, thereby preparing the sol.

[0043] The above-prepared sol was atomized into a corundum crucible by a pressure atomization method, the atomization pressure was 0.3 MPa, and the temperature of the corundum crucible was 500°C. After the atomization of the sol was completed, the temperature of the corundum crucible was raised to 900° C. for 1 hour, and then cooled to room temperature to obtain 3...

Embodiment 2

[0049] With a purity of 99.99% Zr(NO 3 ) 4 ·3H 2 O and Y (NO 3 ) 3 ·6H 2 O is the raw material, in molar ratio Zr(NO 3 ) 4 ·3H 2 O:Y(NO 3 ) 3 ·6H 2 O=0.94:0.06 ingredients, use deionized water as solvent, prepare an aqueous solution with a total concentration of metal ions of 0.2mol / L, stir magnetically for 1-3h until it is clear and transparent, then add additives such as citric acid hexahydrate and molecular weight of 20000 Polyethylene glycol, wherein the amount of citric acid added 160g / L, polyethylene glycol 20g / L, and then magnetically stirred until clear and transparent, thereby preparing the sol.

[0050] The above-prepared sol was atomized into a corundum crucible by a pressure atomization method, the atomization pressure was 0.3 MPa, and the temperature of the corundum crucible was 500°C. After the atomization of the sol was completed, the temperature of the corundum crucible was raised to 900° C. for 1 hour, and then cooled to room temperature to obtain 3...

Embodiment 3

[0057] With a purity of 99.99% Zr(NO 3 ) 4 ·3H 2 O and Y (NO 3 ) 3 ·6H 2 O is the raw material, in molar ratio Zr(NO 3 ) 4 ·3H 2 O:Y(NO 3 ) 3 ·6H 2 O=0.94:0.06 ingredients, use deionized water as solvent, prepare an aqueous solution with a total concentration of metal ions of 0.2mol / L, stir magnetically for 1-3h until it is clear and transparent, then add additives such as citric acid hexahydrate and molecular weight of 20000 Polyethylene glycol, wherein the amount of citric acid added 160g / L, polyethylene glycol 20g / L, and then magnetically stirred until clear and transparent, thereby preparing the sol.

[0058] The above-prepared sol was atomized into a corundum crucible by a pressure atomization method, the atomization pressure was 0.3 MPa, and the temperature of the corundum crucible was 500°C. After the atomization of the sol was completed, the temperature of the corundum crucible was raised to 900° C. for 1 hour, and then cooled to room temperature to obtain 3...

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Abstract

Belonging to the field of zirconia ceramics, the invention relates to a high toughness yttrium oxide stabilized tetragonal zirconia material unaffected by sintering and a preparation method thereof. The high toughness yttrium oxide stabilized tetragonal zirconia (3Y-TZP) material unaffected by sintering has a particle size of 100nm-900nm, no monoclinic phase, a sintered density of 5.63 g / cm<3>-6.05g / cm<3>, and a relative density of 92.6%-99.5%. Compared with similar technologies, the method provided by the invention enables uniform reaction of the raw materials at atomic scale, and avoids hydrolysis of zirconium ions, so that the starting raw materials have no monoclinic phase; the sintering temperature range is wide from 1350DEG C to 1550DEG C, and the sintering process becomes simple; and the toughness is relatively high, and does not decrease significantly along with the sintering time and temperature.

Description

technical field [0001] The invention relates to a high-toughness yttria-stabilized tetragonal zirconia material and a preparation method thereof which are not affected by sintering, and belongs to the field of zirconia ceramics. Background technique [0002] The yttrium oxide partially stabilized tetragonal zirconia (3Y-TZP) material with a mole fraction of 3% has the characteristics of high melting point, low thermal conductivity, high strength, high toughness, corrosion resistance and excellent chemical stability, especially has good Mechanical properties, such as bending strength up to 1000MPa, fracture toughness up to 3.0-6.5MPam 1 / 2 , in machinery, electronics, petroleum, chemical industry, aviation, aerospace, textiles, precision instruments and medical and other industries have a wide range of application value. [0003] Nearly fully dense 3Y-TZP ceramics prepared by traditional high-temperature sintering process are susceptible to ZrO 2 Limitations of the thermodyn...

Claims

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Application Information

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IPC IPC(8): C01G25/02C04B35/48C04B35/622
CPCC01G25/02C04B35/48C04B35/622C04B2235/3246C01P2004/82C01P2002/72C01P2004/03
Inventor 王欣江阔刘松柏薛敏
Owner SOUTHWEAT UNIV OF SCI & TECH
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